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Methanogenic pathway and archaeal community structure in the sediment of eutrophic Lake Dagow: effect of temperature.
Microb Ecol. 2004 Oct; 48(3):389-99.ME

Abstract

Methanogenic degradation of organic matter is an important microbial process in lake sediments. Temperature may affect not only the rate but also the pathway of CH4 production by changing the activity and the abundance of individual microorganisms. Therefore, we studied the function and structure of a methanogenic community in anoxic sediment of Lake Dagow, a eutrophic lake in north-eastern Germany. Incubation of sediment samples (in situ 7.5 degrees C) at increasing temperatures (4, 10, 15, 25, 30 degrees C) resulted in increasing production rates of CH4 and CO2 and in increasing steady-state concentrations of H2. Thermodynamic conditions for H2/CO2 -dependent methanogenesis were only exergonic at 25 and 30 degrees C. Inhibition of methanogenesis with chloroform resulted in the accumulation of methanogenic precursors, i.e., acetate, propionate, and isobutyrate. Mass balance calculations indicated that less CH4 was formed via H2 at 4 degrees C than at 30 degrees C. Conversion of 14CO2 to 14CH4 also showed that H2/CO2 -dependent methanogenesis contributed less to total CH4 production at 4 degrees C than at 30 degrees C. [2-14 C]Acetate turnover rates at 4 degrees C accounted for a higher percentage of total CH4 production than at 30 degrees C. Collectively, these results showed a higher contribution of H2-dependent methanogenesis and a lower contribution of acetate-dependent methanogenesis at high versus low temperature. The archaeal community was characterized by cloning, sequencing, and phylogenetic analysis of the 16S rRNA genes retrieved from the sediment. Sequences were affiliated with Methanosaetaceae, Methanomicrobiaceae, and three deeply branching euryarchaeotal clusters, i.e., group III, Rice cluster V, and a novel euryarchaeotal cluster, the LDS cluster. Terminal restriction fragment length polymorphism (T-RFLP) analysis showed that 16S rRNA genes affiliated to Methanosaetaceae (20-30%), Methanomicrobiaceae (35-55%), and group III (10-25%) contributed most to the archaeal community. Incubation of the sediment at different temperatures (4-30 degrees C) did not result in a systematic change of the archaeal community composition, indicating that change of temperature primarily affected the activity rather than the structure of the methanogenic community.

Authors+Show Affiliations

Max-Planck-Institute for Terrestrial Microbiology, Karl-von-Frisch Str., 35043, Marburg, Germany, conrad@staff.uni-marburg.de.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

15692859

Citation

Glissman, K, et al. "Methanogenic Pathway and Archaeal Community Structure in the Sediment of Eutrophic Lake Dagow: Effect of Temperature." Microbial Ecology, vol. 48, no. 3, 2004, pp. 389-99.
Glissman K, Chin KJ, Casper P, et al. Methanogenic pathway and archaeal community structure in the sediment of eutrophic Lake Dagow: effect of temperature. Microb Ecol. 2004;48(3):389-99.
Glissman, K., Chin, K. J., Casper, P., & Conrad, R. (2004). Methanogenic pathway and archaeal community structure in the sediment of eutrophic Lake Dagow: effect of temperature. Microbial Ecology, 48(3), 389-99.
Glissman K, et al. Methanogenic Pathway and Archaeal Community Structure in the Sediment of Eutrophic Lake Dagow: Effect of Temperature. Microb Ecol. 2004;48(3):389-99. PubMed PMID: 15692859.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Methanogenic pathway and archaeal community structure in the sediment of eutrophic Lake Dagow: effect of temperature. AU - Glissman,K, AU - Chin,K-J, AU - Casper,P, AU - Conrad,R, Y1 - 2004/06/29/ PY - 2003/05/28/received PY - 2003/08/08/accepted PY - 2005/2/5/pubmed PY - 2005/3/16/medline PY - 2005/2/5/entrez SP - 389 EP - 99 JF - Microbial ecology JO - Microb Ecol VL - 48 IS - 3 N2 - Methanogenic degradation of organic matter is an important microbial process in lake sediments. Temperature may affect not only the rate but also the pathway of CH4 production by changing the activity and the abundance of individual microorganisms. Therefore, we studied the function and structure of a methanogenic community in anoxic sediment of Lake Dagow, a eutrophic lake in north-eastern Germany. Incubation of sediment samples (in situ 7.5 degrees C) at increasing temperatures (4, 10, 15, 25, 30 degrees C) resulted in increasing production rates of CH4 and CO2 and in increasing steady-state concentrations of H2. Thermodynamic conditions for H2/CO2 -dependent methanogenesis were only exergonic at 25 and 30 degrees C. Inhibition of methanogenesis with chloroform resulted in the accumulation of methanogenic precursors, i.e., acetate, propionate, and isobutyrate. Mass balance calculations indicated that less CH4 was formed via H2 at 4 degrees C than at 30 degrees C. Conversion of 14CO2 to 14CH4 also showed that H2/CO2 -dependent methanogenesis contributed less to total CH4 production at 4 degrees C than at 30 degrees C. [2-14 C]Acetate turnover rates at 4 degrees C accounted for a higher percentage of total CH4 production than at 30 degrees C. Collectively, these results showed a higher contribution of H2-dependent methanogenesis and a lower contribution of acetate-dependent methanogenesis at high versus low temperature. The archaeal community was characterized by cloning, sequencing, and phylogenetic analysis of the 16S rRNA genes retrieved from the sediment. Sequences were affiliated with Methanosaetaceae, Methanomicrobiaceae, and three deeply branching euryarchaeotal clusters, i.e., group III, Rice cluster V, and a novel euryarchaeotal cluster, the LDS cluster. Terminal restriction fragment length polymorphism (T-RFLP) analysis showed that 16S rRNA genes affiliated to Methanosaetaceae (20-30%), Methanomicrobiaceae (35-55%), and group III (10-25%) contributed most to the archaeal community. Incubation of the sediment at different temperatures (4-30 degrees C) did not result in a systematic change of the archaeal community composition, indicating that change of temperature primarily affected the activity rather than the structure of the methanogenic community. SN - 0095-3628 UR - https://www.unboundmedicine.com/medline/citation/15692859/Methanogenic_pathway_and_archaeal_community_structure_in_the_sediment_of_eutrophic_Lake_Dagow:_effect_of_temperature_ DB - PRIME DP - Unbound Medicine ER -